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    <title>辅导答疑平台-首页</title>
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    <style>
        .question-rank{
            width:18px;
            padding-right: 3px;
        }
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</head>

<body style="background-color: #efefef;">
    <nav class="navbar navbar-default">
        <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
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                <a class="navbar-brand" href="#">答疑平台</a>
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            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">主页 <span class="sr-only">(current)</span></a></li>
                    <li><a href="#">问题广场</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                            aria-expanded="false">问题分类 <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="#">语文</a></li>
                            <li><a href="#">数学</a></li>
                            <li><a href="#">英语</a></li>
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                <form class="navbar-form navbar-left">
                    <div class="form-group">
                        <input type="text" class="form-control" placeholder="请输入问题描述">
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                    <li><a href="#">登录</a></li>
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        <div class="row">
            <div class="col-sm-12">
                <div class="col-lg-9 col-md-12 col-sm-12 col-xs-12" style="background-color: white;">
                    <h3>
                        <i class="fa fa-book fa"></i>
                        <span>发现</span>
                    </h3>
                    <ul class="nav nav-tabs">
                        <li role="presentation" class="active"><a href="#">语文</a></li>
                        <li role="presentation"><a href="#">数学</a></li>
                        <li role="presentation"><a href="#">英语</a></li>
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div>
                      <div class="media">
                        <div class="media-left">
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
                          <a href="#">
                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
                          <a href="#">
                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
                      </div><div class="media">
                        <div class="media-left">
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                            <img class="media-object img-rounded" src="/img/logo.jpg" style="width:38px; height: 38px;" alt="...">
                          </a>
                        </div>
                        <div class="media-body">
                          <h4 class="media-heading"><a href="#">第一个语文问题</a></h4>
                          <div class="question-disc">2020年10月17日09:12:46</div>
                        </div>
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                    <h3>
                        <i class="fa fa-paper-plane-o"></i>
                        <span>热门问题</span>
                    </h3>
                    <ul class="list-group">
                        <li class="list-group-item"><img class="question-rank" src="/img/icon-1.png">Cras justo odio</li>
                        <li class="list-group-item"><img class="question-rank" src="/img/icon-2.png">Dapibus ac facilisis in</li>
                        <li class="list-group-item"><img class="question-rank" src="/img/icon-3.png">Morbi leo risus</li>
                        <li class="list-group-item"><img class="question-rank" src="/img/icon-4.png">Porta ac consectetur ac</li>
                        <li class="list-group-item"><img class="question-rank" src="/img/icon-5.png">Vestibulum at eros</li>
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